角抽运Nd:YAG复合板条946 nm连续运转激光器

报道了一种适合中小功率输出的全固态激光器的角抽运方法, 抽运光从板条激光器中板条晶体的角部入射, 可获得较高的抽运效率和较好的抽运均匀性.采用单角抽运方式, 首次进行了角抽运Nd:YAG复合板条946 nm连续运转激光器的实验研究. 激光腔采用紧凑型平凹直腔结构, 腔长仅为20 mm. 当注入抽运功率为50 W时, 946 nm激光连续输出功率最高达5.29 W, 光光转换效率为10.6%, 斜效率为12%. 整台激光器结构紧凑, 调谐简单, 成本低, 具有广阔的应用前景. 关键词： 角抽运 Nd:YAG晶体 连续波 946 nm激光     

104 W内腔倍频全固态Nd:YAG绿光激光器

报道了一台高功率内腔倍频全固态Nd:YAG绿光激光器,针对KTP晶体热效应和激光热稳定腔,采取了对KTP晶体进行低温冷却的优化措施,以便减少KTP晶体的热效应导致的相位失配,同时兼顾了Nd:YAG棒的热致双折射效应和KTP晶体热透镜效应,设计了热稳定谐振腔;实验中采用80个20 W激光二极管阵列侧面抽运Nd:YAG棒和Ⅱ类相位匹配KTP晶体(在27℃时相位匹配角为φ=23.6°;θ=90°,尺寸为7 mm×7 mm×10 mm)内腔倍频技术,谐振腔腔长为530 mm,KTP晶体的冷却温度为4.3 ℃,抽运电流为18.3 A时,实现平均功率达104 W、脉冲宽度为130 ns的532 nm激光输出;其重复频率为20.7 kHz.光-光转换效率为10.2%.     

LD泵浦Nd：YAG/Cr：YAG腔外频率变换高功率紫外激光器

用KTP晶体对激光二极管端面泵浦的Nd:YAG晶体;Cr:YAG被动调Q产生的1064nm脉冲激光器进行腔外倍频,用BBO晶体四倍频产生266 nm紫外激光.用15 W的LD阵列;当LD泵浦功率为12 W的情况下;红外(1064 μm)调Q平均输出功率为2.2 W;脉冲序列周期为40 μs;脉宽为18ns;峰值功率高达4.9kW.采用KTP腔外二倍频;532nm的绿光输出平均功率为850mW;用BBO腔外四倍频;266nm的紫外光输出平均功率高达215mW，绿光-紫外光光转换效率为25.2%, 红外到紫外总的转换效率为9.8%.     

LD泵浦Nd∶YAG/Cr∶YAG腔外频率变换高功率紫外激光器

用KTP晶体对激光二极管端面泵浦的Nd∶YAG晶体,Cr∶YAG被动调Q产生的1064 nm脉冲激光器进行腔外倍频,用BBO晶体四倍频产生266 nm紫外激光.用15 W的LD阵列,当LD泵浦功率为12 W的情况下,红外(1064μm)调Q平均输出功率为2.2 W,脉冲序列周期为40μs,脉宽为18 ns,峰值功率高达4.9 kW.采用KTP腔外二倍频,532 nm的绿光输出平均功率为850 mW;用BBO腔外四倍频,266 nm的紫外光输出平均功率高达215 mW,绿光-紫外光光转换效率为25.2%,红外到紫外总的转换效率为9.8%.     

激光器结构与设计

用磷酸氧铁钾(KTP)作为倍频晶体,对Nd,YAG声光调Q激光的环形腔外腔倍频技术进行了实验和理论的研究,利用最大平均功率sow、声光调Q、输出频率1005 Hz、灯抽运Nd,YAG激光器作为基频光光源,在基频输人功率35W时,获得了大约为31.4%的光一光转换效率的绿光输出。从实验结果分析了环形腔倍频的特性,指出了该方法     

LD抽运Nd：YAG／KTP腔内倍频连续绿光激光器实验研究

设计了LD端面抽运固体激光器平台,研究了LD抽运Nd:YAG/KTP腔内倍频连续绿光的输出特性、光-光转换效率、输出功率稳定性,并实验验证了倾斜反射镜的选模效果.该系统实现了基横模绿光输出,椭圆度达0.96.     

高重复频率LD端面抽运声光调Q腔内倍频绿光激光器

利用LD端面抽运声光调Q Nd∶YVO4激光器作为抽运源,采用线性腔实现了KTP腔内倍频高效绿光激光的输出.在调Q脉冲重复频率为40 kHz、1 064 nm输入光的功率为1 608 mW的条件下,获得了999 mW单横模（TEM00模）的绿光输出,相应的光-光转换效率为62.1%.绿光激光器输出光谱的半峰宽小于0.11 nm,其输出功率的不稳定度为±1.2%.     

36 W侧面抽运腔内倍频Nd:YAG/KTP连续绿光激光器

通过优化平-凹-平三镜折叠腔结构设计,利用大功率半导体激光器侧面抽运、Ⅱ类相位匹配KTP晶体腔内倍频,获得高效高功率连续绿色激光输出.当抽运电流约为36 A时,得到最高36.6 W的连续绿光激光输出,对应的光—光转换效率为8.71％.在输出功率33 W时测量激光功率稳定性,其功率不稳定度为0.27%.用刀口法测量了激光器高输出功率时的光束质量,光束质量因子小于8.对高功率抽运情况下三镜折叠腔的像散补偿、失调灵敏度和基模在腔内分布情况做了数值模拟. 关键词： 侧面抽运 腔内倍频 连续波     

基于LD双端面泵浦的Nd:YAG高效率倍频激光器

报道了一种利用激光二极管（LD）双端面泵浦的Nd：YAG激光晶体,Cr⁴⁺：YAG晶体被动调Q,LBO临界相位匹配腔内倍频的高转换效率的绿光激光器。分析了双端面泵浦YAG激光器的热效应,实验中LD双端面泵浦,采用U型平行平面腔结构对Nd：YAG进行传导冷却。当总泵浦光为33.8 W时,得到被动调Q频率10 KHz、功率8.21 W的线偏振基频光输出。6.72 W的绿光输出的倍频效率为86%,输出光束为基模,M²为1.4。实验表明双端面泵浦YAG倍频激光器具有很高的转换效率。     

紧凑型LD端面抽运Nd:YAG内腔三倍频准连续355 nm紫外激光器

报道了一台LD端面抽运Nd:YAG晶体内腔三倍频355 nm激光高效率、高峰值功率准连续输出的全固态紫外激光器.激光腔采用紧凑型平平直腔,腔长仅106 mm.当注入抽运功率为5.73 W、重复频率为9 kHz时,获得163 mW的355 nm激光准连续输出,光光转换效率达到最高2.84％.当注入抽运功率为6.7 W重复频率为5 kHz时,获得最高174 mW的355 nm激光准连续输出,输出功率短期不稳定性为5％,光束质量因子M²为3.79.当注入抽运功率为5.73 W、重复频率为2 kHz时,获得112 mW的355 nm激光准连续输出,峰值功率最高达到9.15 kW.通过采用内腔倍频技术和设计合理的腔结构,实现了中小功率准连续输出的全固态紫外激光器的小型化、便携化,进一步拓宽了紫外激光器的应用领域. 关键词： LD端面抽运 内腔三倍频 Q')" href="#">声光调Q 紫外激光     

LD侧面泵浦Nd∶GdVO4 532 nm绿光激光器

为了获得高功率窄脉宽532 nm绿光激光输出,通过高重复频率声光驱动调Q技术和LD侧面泵浦Nd∶GdVO4技术,获得高功率线偏振1 064 nm激光输出。采用内腔倍频方式,对非线性晶体KTP进行频率变换,实现高功率窄脉宽绿光激光输出。在电源输入电流30 A,调Q驱动频率10 kHz的条件下,获得最高功率30 W线偏振1 064 nm激光输出,脉宽30 ns,倍频KTP晶体获得23.4 W的532 nm绿光输出,1 064 nm到532 nm转化效率为78%。实验结果表明:通过声光调Q技术和LD侧面泵浦Nd∶GdVO4技术,可以实现高功率线偏振窄脉宽1 064 nm激光输出,倍频非线性晶体KTP可获得高功率窄脉宽532 nm激光。     

50.2W high stability and high compact all-solid-state green laser with extra-cavity frequency-doubling at 500 Hz

A 50.2W high pulse energy green laser system at 532 nm was demonstrated by extra-cavity second-harmonic generation (SHG). The fundamental laser was based on laser diode (LD) side-pumped MOPA Q-switched technology, producing 79W of average power at the repetition rate of 500 Hz, while the pulse width was 6 ns. Type-II angle phasematched KTiOPO₄ (KTP) crystal was used as the nonlinear crystal. The 50.2W average power of 532 nm laser was obtained with the divergence angle less than 0.6 mrad and the corresponding peak power of 16.7MW. The optical frequency conversion efficiency from fundamental to green laser was up to 63.5%. The measured output power fluctuation was less than 0.38% in one hour operation.     

Diode-pumped Nd:LGS intracavity-doubled green laser at 532 nm

It is reported that efficient continuous-wave (CW) green laser generation at 532 nm in a KTP crystal at type-II phase matching direction performed with a diode-pumped Nd:LGS laser. With incident pump power of 18.2 W, output power of 2.68 W at 532 nm has been obtained using a 5 mm-long KTP crystal. The optical conversion efficiency was up to 14.7%. At the output power level of 2.68 W, the output stability is better than 3.5%. The beam quality M ² values were equal to 1.33 and 1.19 in X and Y directions, respectively.     

Generation of 5-W deep-UV continuous-wave radiation at 266 nm by an external cavity with a CsLiB6O10 crystal

A Brewster-cut CsLiB6O10 crystal is employed as an external resonant frequency doubler to generate cw deep-UV radiation at 266 nm. We have generated 5.0 W of usable cw output power, which is 6.1 W in the crystal, for an incident green power of 9.6 W, corresponding to an internal conversion efficiency of 61.8%. The power obtained is, to our knowledge, three times higher than previously reported for cw 266-nm generation.     

高功率全固态绿光激光技术研究进展

 报道了高功率全固态腔内和腔外倍频两种绿光激光器研究进展。腔内倍频绿光激光器采用L型腔双棒串接结构,在重复频率10 kHz时,用三硼酸锂晶体倍频获得绿光功率186 W,光-光效率达15.8%。腔外倍频绿光激光器采用主振荡和功率放大器,在重复频率400 Hz时,获得基频激光单脉冲能量1.2 J,采用Ⅱ类相位匹配KTP晶体腔外倍频,获得525 mJ的绿光输出,倍频效率为43.7%。采用偏振合成技术获得了单脉冲能量大于1 J的绿光输出。在该激光放大器实验装置上,进行了双模块热效应补偿技术和受激布里渊散射相位共轭技术实验研究,改善了激光光束质量。     

All-solid-state Nd:Gd<Subscript>0.18</Subscript>Y<Subscript>0.82</Subscript>VO<Subscript>4</Subscript>-LBO green laser at 532 nm

We report a continuous-wave (CW) coherent green radiation at 532 nm by intracavity frequency doubling generation of 1064 nm Nd:Gd_0.18Y_0.82VO₄ laser. With incident pump power of 18.2 W, output power of 1.08 W at 532 nm has been obtained using a 5 mm-long KTP crystal. The optical conversion efficiency was up to 5.9%. At the output power level of 1.08 W, the output stability is better than 5%. The beam quality M² values were equal to 1.26 and 1.12 in X and Y directions, respectively.     

基于水、风混合型冷却系统的LD端面泵浦全固态连续绿光激光器

为了简化激光器冷却系统,减小体积,降低成本,设计出一种基于水、风混合型的冷却系统,具有水冷和风冷的优点,可以实现稳定的绿光激光输出.采用结构简单、紧凑的平-凹腔设计,其端镜为平面镜,输出镜为凹面镜,曲率半径R=1 m,腔长L=165 mm,获得较稳定的单端泵浦Nd:YVO4腔内倍频KTP连续绿光激光输出.当晶体吸收的泵浦功率为24.3 W时,532 nm激光功率达到4.2 W,光-光转换效率达到17.2%.在绿光输出功率为3 W的情况下,观测到的变化范围在2.5%左右,温度变化范围在0.1°左右.实验结果表明,该冷却系统能够较好地转移晶体热效应产生的热量,实现转化效率较高的绿光输出,有利于实现高功率激光器的微型化.     

高效率Nd:YVO4/LBO临界相位匹配脉冲绿光激光器

报道了一种利用激光二极管（LD）端面泵浦Nd:YVO4晶体,声光调Q,LBO临界相位匹配腔内倍频的高效率、小体积、风冷绿光激光器。分析了不同偏振光泵浦的情况下,激光晶体对泵浦光的吸收特性。由分析得出,采用部分偏振光泵浦,可以提高激光晶体对泵浦光吸收均匀性,改善基波畸变,获得高转换效率激光输出。实验中,在泵浦光功率为33 W、声光调Q重复频率为20 kHz时,得到脉宽为23.96 ns、平均功率为15 W的1064 nm基频光输出。经倍频后,得到平均功率为11.2 W的绿光输出,倍频效率为74.6%,总体光-光转换效率为34%。在输出功率为10 W时,测得1 h内输出功率不稳定度为0.512 2%,水平方向和竖直方向的光束质量因子M2分别为1.2和1.1。     

Efficient stable simultaneous CW dual-wavelength diode-end-pumped Nd :YAG laser operating at 1.319 and 1.338 μm

An efficient, stable diode-end-pumped simultaneous continuous-wave (CW) dual-wavelength laser operating at 1.319 and 1.338 μm in a Nd:YAG crystal has been demonstrated. A total output power of 6.3 W is achieved at an absorbed pump power of 15 W, with a slope efficiency of 43.5%. The instability of output power is less than 1%. With a type Ⅱ critical phase-matched KTP crystal inserted into the cavity as frequency doubler, a maximum output power of 200 mW in red region is acquired. In addition, a sixwavelength laser operation at 1.319 μm, 1.338 μm, 1.356 μm, 659.5 nm, 669 nm, and 678 nm is observed.     

LD抽运Nd:Gd1-xYxVO4连续波激光器的实验研究

报道了一种半导体二极管(LD)抽运Nd:Gd1-xYxVO4晶体,采用简单、结构紧凑的平-平腔设计,实现了1.06 μm连续波激光输出,在8 W的注入功率下,获得3.25 W的1.06 μm连续波激光输出,光-光转换效率为41%,斜效率为45%.KTP腔内倍频实现了稳定的连续波532 nm绿光激光运转,当注入功率为8 W时,单向获得了621 mW的单模绿光输出.